Fraud detection is difficult when there's no uniformity in experience. PayPal's "redirect the user through our services" flows provide more uniformity than som

Fraud detection is difficult when there's no uniformity in experience. PayPal's "redirect the user through our services" flows provide more uniformity than some random site with a hosted-- or even baked-into-the-shopping-cart-- credit card form-- but I wouldn't say it's uniform enough that people would be able to reliably identify something outside the norm. Just think of currency-- could you spot a decent quality counterfeit? Particularly if you're dealing with a more edge-case design that you don't encounter every day (say, a Series 1934 $50 note)?